BMJ. 1995 Dec 09;311(7019):1517-8. doi: 10.1136/bmj.311.7019.1517.
BMJ (Clinical research ed.)
B Hurwitz
PMID: 8520379 PMCID: PMC2548183 DOI: 10.1136/bmj.311.7019.1517 Free PMC Article
[No abstract available.]